Electric arc lamp



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ELECT RIO ARC LAMP. No. 599,818. Patented Mar. 1, 1898.

(No Model.) 3 Sheets-Sheet 3. E. P. WARNER & H. H. WAIT.

ELECTRIC ARC LAMP.

No. 599,818. Patented Mar. 1, 1898.

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- UNITED STATES PATENT OFFICE.

ERNEST P. WARNER AND HENRY H. \VAIT, OF CHICAGO, ILLINOIS, ASSIGN- ORSTO THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMVP.

SPECIFICATION forming part of Letters Patent No. 599,818, dated March 1,1898.

Application filed March 16, 1897- Serial No. 827,792- (No model.)

To all whom it may concern.-

Be it known that we, ERNEST P. WARNER and HENRY H. WAIT, citizens of theUnited States, residing at Chicago, in the county of Cook and State ofIllinois, have invented a certain new and useful Improvement inElectric-Arc Lamps, of which the following is a full, clear, concise,and exact description, reference being had to the accompany- IO ingdrawings, forming a part of this specification.

Our invention relates to electric-arc lamps, having in mind moreparticularly that class commonly used for street-lighting.

Trouble has frequently been experienced during wet weather by leakage ofcurrent to ground, and the metallic carbon-rod sheath, by which it is acommon practice to suspend the lamp, frequently forms a conductorthrough which this leakage occurs.

Our invention contemplates an improved structure whereby the possibilityof trouble from this source is greatly decreased, if not absolutelyprevented.

Our invention further contemplates an improved construction of thelamp-frame,whereby the operating mechanism may be readily removed forrepairs or other purposes without the necessity of taking down the wholelamp from its support. A considerable economy of time and labor is thuseffected, to gether with increased convenience in handling.

Generally speaking, our invention consists 3 5 in an improvedconstruction wherein the lamp is provided with a sheath formed ofinsulating material united with its roof and forming a verticalextension thereof, by which sheath the lamp is adapted to be suspended,said sheath being provided with one or more bores or conduits extendinglongitudinally therethrough and communicating with the interior of thelamp-frame through an opening in said roof, through which bore orconduit the conducting-wire may be passed to the operating mechanism inthe interior of the lamp with out exposure to the Weather or to anygrounded metallic parts or conductors. When used in connection witharc-lamps in which the carbon is suspended by a feed-rod, said sheathalso serves to protect the upper portion of said feed-rod. Theinsulating sheath or chimney is itself preferably protected frommoisture by a hood or canopy, thus affording increased immunity againstany passage of current to ground.

Further details of our invention will be readily understood by referenceto the accompanying drawings, in which- Figure 1 shows an elevation ofan arc-lamp protected after the manner of our invention. Fig. 2 is asectional view of the insulatingsheath and adjacent parts. Fig. 3 showsthe sheath in cross-section. Fig. 4; is a plan View of a clamping-collarwhich we prefer to employ in securing the sheath to the canopy. Fig. 5is an elevation thereof. Fig. 6 illustrates our invention as applied toa chainfeed lamp in which a long carbon rod is not used. Fig. 7 showsour invention applied to a lamp of the kind shown in Fig. 1, butsuspended by a rope instead of directly united with the lamp-post. Fig.8 is a vertical sectional View of a portion of the lamp of ourinvention, showing our improved means for removing the operatingmechanism from the frame. Fig. 9 is a sectional view on line 9 9 of Fig.8, some of the parts being removed and others being slightly changed inposition, showing the supports for the operating mech- 8o anism inreadiness to be removed from the frame.

Like letters refer to like parts throughout a the several figures.

The roof of the lamp-frame is shaped to form a hole or socket a, inwhich the lower end of the sheath Z) is retained. We preferably make thelatter of basswood treated thoroughly with asphaltum. It is providedwith an enlarged end at the bottom and when 0 introduced into the socketfrom below is driven upward until the faces I) 19* come into engagementwith complemental parts a a of the socket, forming a very tight joint.The socket is provided with a recessed portion of, where the sheathemerges therefrom, thus forming an annular channel into which oakum,cotton, or other packing should be tamped and the junction coated withmarine glue. The upper end of the sheath is recessed, as shown, toprovide an engaging surface or seat for the collar d, which is formed intwo parts united by screws or bolts (1 d, thus clamping the sheath veryfirmly. A

flange d extends around the upper edge of the collar.

The canopy g is secured to the lamp-post in a well-known manner, and thecollar is fastened, to its under side by screws 6, passing through theflange 01 Rubber washers f f are interposed between the flange and thecanopy, and by reason of the compressibility the lamp may be adjusted ina correct vertical position by tightening or loosening one or another ofthe screws 6. The sheath now closes the passage from the post into thehood and forms a closed chamber therewith.

A hole 19 is provided throughout the length of the sheath in which theupper portion of the carbon rod 1' is inclosed, and the conductors h hfrom the street-mains are led through the lamp-post and to the operatingmechanism through ducts b biprovided in the wooden sheath. The latterthus serves at the same time as a conduit for the conductors, aprotecting-sheath for the carbon rod, and means for thoroughly andcompletely insulating the lamp-frame from the metallic post and ground.

In cases where a ribbon-feed lamp is employed, there being no carbonrod, the hole 12 may be omitted, the construction being otherwisepractically unchanged.

In the arrangement as preferably constructed the canopy g is intended tobe permanently secured to the lamp-support. It is to this canopy thatthe lamp is attached, as we have already stated, by means of the collar,through which the screws 6 e are inserted. We have found that aninsulating-section, forming at the same time a protecting-sheath for thewires and a mechanical support for the lamp, serves to effectuallyinsulate the lamp from the post.

In Fig. 6 we have shown but one duct for the reception of the conductorsh h, a long carbon rod not being employed in this style of lamp.

Referring to Figs. 8 and 9, the frame 76, which supports the operatingmechanism of the lamp, is secured to the frame in the following manner:The pipe '11, which forms a part of the supporting-framework of thelamp, is engaged bya clamp 7c, pivoted at 7& to the part it. A bolt Z ispivoted at Z to the clamp is and is adapted to be engaged by athumbnut m(shown in dotted lines in Fig. 9) to secure the clamp is in engagementwith the pipe n. A post 0 is mounted upon the frame, as shown in Fig. 8,and is provided with a threaded extension 0, adapted to be engaged by athumb-nut 19, between which and the post a portion of the part It isrigidly held.

Binding-posts q q are provided upon the upper part of the frame it, towhich the conductors h h are secured.

To remove the operating mechanism as a whole from the frame of the lampit is only necessary to slide the casing 7 down ward and unscrew thethumb-nut m from bolt Z, when the clamping portion k may be turned uponits pivot 10 into the position shown in Fig. 9. When the thumb-nut p isremoved from the extension 0 and the conductors h h released frombinding-posts q q, the operating mechanism is completely detached fromthe rest of the lamp and may be removed at pleasure. The work of placingthe operating mechanism in position is performed with equal facility. I

The canopy may be dispensed with in certain cases or varied withrelation to the insulating section or sheath while other features of ourinvention are retained.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. In an electric-arc lamp, the combination with the lamp-frame, of aninsulating-chimney therefor, from which the lamp may be suspended, andwhich is rigidly secured to the lamp, and a duct or ducts in saidchimney adapted to receive the carbon or feed rod and the conductorsleading to the operating mechanism, substantially as described.

2. The combination with the framework of an arc-lamp, of an extension orpost 0 provided thereon, a frame is supporting the operating mechanismand removably mounted upon said post, and a clamping portion it uponsaid frame is adapted to removably clamp the same to a portion n of theframework of the lamp, whereby the frame 70 and the operating mechanismsupported thereby may be removed as a whole from the main framework ofthe lamp, substantially as described.

3. In an electric-arc lamp, the combination with a lamp-frame, of lampmechanism contained within the same, a roof for the frame for affordingprotection to the lamp mechanism within the frame,said roof beingprovided with an opening, a sheath formed of insulating material unitedwith the aforesaid roof and forming a Vertical extension thereof, saidsheath being provided with a bore or duct extending longitudinallytherethrough and communicating with the interior of the lampframethrough said opening in the roof, and conducting-wire protected by andpassing through said sheath into the interior of the lamp-frame andconnected or adapted to be connected in circuit with the operatingmechanism of the lamp, said sheath being constructed to support orsuspend the lamp, substantially as described.

4. The combination with an arc-lamp, of a chimney of insulating materialby which the lamp is supported, duets therein adapted to our names this17th day of February, A. D. receive and protect the carbon or feed rod1897.

and the conductors leading to the lamp, and ERNEST P. WARNER. a hood orcanopy adapted to protect said in- HENRY H. XVAIT.

5 sulatingchimney from moisture, substau- Witnesses:

tially as described. D. XV. O. TANNER,

In witness whereof We hereunto subscribe E.'L. MAUERMANN.

